Unlinking a checklist will remove the checklist in the job including the answers which cannot be undone. You can link the checklist again but the answers will not available anymore.
HOW TO UNLINK CHECKLIST
Navigate to Jobs. Click the link "Manage Checklist" to view the list of associated checklist in the job:
Open the checklist you want to unlink. At the upper right corner, click the Checklist Actions:
Read the warning carefully then click "Confirm." The checklist will then be successfully unlinked from the Job: